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Most power out of a built XR600/628/640/660?

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Just wondering what the most pump-gas horsepower you can get out of an XR600 based engine is. All I can compare it to(and its not really a comparison) is a 650R. Also, how badly does building the engine affect lengetivity?

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I got 48 RWhp out of my XR620R mild cam, wisco piston 12:1 piston (bad choice)

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